Improvement in steam-engines



C. ERVIEN.

STEAM-ENGINE.

Patented Sept. 12, 1876.

N- PETERS, PHOTQ-L|THOGRAPHER, WASHINGTON, D CV UNITED STATES PATENTOFFICE.

CHARLES W. ERVIEN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT'IN STEAM-ENGINES.

Specitication forming part of Letters Patent No. 182,183, datedSeptember 12, 1876; application led August 4,1816. y

Be it known that I, CHARLES W. ERvIEN,

0f Philadelphia, Pennsylvania, have invented an Improvement inSteam-Engines, of which the following is a spccication:

The object of my invention is toaiford facilities for starting asteam-engine when the valve or valves cover both steam-ports and excludethe steam from .the usual passages.

In the accompanying drawing, Figure l is a sectional view of part of asteam-cylinder with steam-chest and valve, and containing myimprovement; Fig. 2, a sectional plan on the line 1 2, and Fig., 3 amoditicatiou of my invention.

Arepresents part of the cylinder of a steamengine, and B thesteam-chest. In the present instance there is a duplex valve, D D',connected to the valve-spindle and adapted to the steamports a andexhaust-ports b in the usual manner.

When the engine has stopped at such a point that the valve covers bothsteam-ports,

.as shown in Fig. 1', the operation' ofthe valve by hand becomesnecessary in starting an ordinary engine, and this is usuallyaccomplished by throwing the end of the eccentric rod out ot' gear andmanipulating a lever connected to the valve-spindle-operatious demandingcostly appliances, which I dispense with by arranging within the steam-chest a supplementary valve-seat, Gr, having two ports, m m', theformer communicating, through a passage, u, with the main steam-port atone end of the cylinder, and the other, through a passage, n', with thesteam-port at the opposite end of the cylinder. To the valv'eseat G isadapted a small valve, H, attached to a spindle, I,'which passes througha stuffing- `box on the steam-chest.

r point that the main valve covers both steamports a a.

Instead of making long passages -n n', communicating with thesteam-ports, and a single seat for a single supplementary valve, theremay be within the chest two seats for a du plex supplementary valve, HH, adapted to ports m, communicatingthrough short passages with the mainsteam-ports.

l do not desire to claim, broadly, the use of a supplementary valve forintroducing steam to the cylinder when both steam-ports are closed; nordo I restrict the application of my invention to a valve of the classshown, as it may be applied to different styles of valves; but Y I claimas my invention- The combination, with the steam-chest B and its mainvalve, of the supplementary valve seat or seats G, arranged within thechest, the ports m m', communicating with the main steam-passages, andthe supplementary valve or valves H, all substantially as set forth. Y

In testimony whereof I have signed my name to this `specification in thepresence of two subscribing witnesses.

CHARLES W. ERVIEN.

Witnesses:

HARRY HoWsoN, Jr.,

HARRY SMITH.

